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  <title>作废缓存中的所有元素</title>

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 <div class="refnamediv">
  <h1 class="refname">Memcached::flush</h1>
  <p class="verinfo">(PECL memcached &gt;= 0.1.0)</p><p class="refpurpose"><span class="refname">Memcached::flush</span> &mdash; <span class="dc-title">作废缓存中的所有元素</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-memcached.flush-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">bool</span> <span class="methodname"><strong>Memcached::flush</strong></span>
    ([ <span class="methodparam"><span class="type">int</span> <code class="parameter">$delay</code><span class="initializer"> = 0</span></span>
  ] )</div>

  <p class="para rdfs-comment">
   <span class="function"><strong>Memcached::flush()</strong></span>立即（默认）或者在<em><code class="parameter">delay</code></em>延迟后作废所有缓存中已经存在的元素。
   在作废之后检索命令将不会有任何返回（除非在执行<span class="function"><strong>Memcached::flush()</strong></span>作废之后，该key下被重新存储过）。flush不会
   真正的释放已有元素的内存， 而是逐渐的存入新元素重用那些内存。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-memcached.flush-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">delay</code></em></dt>

     <dd>

      <p class="para">
      在作废所有元素之前等待的时间（单位秒）。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-memcached.flush-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
   如需要则使用 <span class="methodname"><a href="memcached.getresultcode.html" class="methodname">Memcached::getResultCode()</a></span>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-memcached.flush-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4344">
    <p><strong>Example #1 <span class="function"><strong>Memcached::flush()</strong></span> 示例</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$m&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Memcached</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">addServer</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">11211</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/*&nbsp;10秒内清除所有元素&nbsp;*/<br /></span><span style="color: #0000BB">$m</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">flush</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


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